Four South Coast railway stations are getting a new look as part of a $33 million expansion of a scheme to clean up platforms.

More than 56 stations - mainly "hub" stations - will be updated by the end of 2014.

"Wollongong, North Wollongong, Dapto and Thirroul stations, four of the larger stations on the South Coast line, are undergoing a refresh as part of the NSW TrainLink station refresh program," a TrainLink spokeswoman said.

The revamp is already under way at all four South Coast stations and the range of work at each varies.

"Work is being tailored to the needs of individual stations," the spokeswoman said.

"But it will include a selection of new furniture, toilets, lift interiors, tiling, painting, garden beds and improved lighting.

"Stations will also undergo a deep clean and will have a fresh coat of paint where needed," she said.

Electronic customer information screens have been added at Thirroul and Dapto stations.